Network Associates Virus Information Library: W32/Sobig.f@MM
Characteristics and removal instructions for the Sobig variant that propagates via email, constructing outgoing messages with its own SMTP engine.
vil.nai.com/vil/content/v_100561.htm
Symantec Security Response: W32.Sobig.F@mm
Details and removal instructions for the mass-mailing, network-aware worm that sends itself to all the email addresses that it finds with certain extensions.
securityresponse.symantec.com/avcenter/venc/data/w32.sobig.f@mm.html